Jean-Claude Bunzli - Self-assembly of a helical zinc-europium complex: speciation in aqueous solution and luminescence

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      Deiters,Emmanuel, Eliseeva,Svetlana V., B nzli,Jean-Claude G.   Frontiers in Chemistry 2013 1  Art. Nr. 15-

      Abstract: Two new tridentate(NNO)-bidentate(NN)   compartmental ligands, HL5 and HL6, are synthesized from pyridine   and benzimidazole synthons. They react in aqueous solution under   physiological conditions with ZnII, LnIII, or a mixture thereof,   to yield complexes of different stoichiometries, 1:3, 2:2, 2:3,   1:1:3, the speciation of which is established by UV-visible   titrations and ESI mass spectrometry. Photophysical studies of   the EuIII-containing solutions in Tris-HCl 0.1 M (pH = 7.4) show   that lanthanide luminescence arises from a unique N6O3   coordination site with pseudo D3 symmetry. Relevant parameters   such as crystal field splitting, lifetime, radiative lifetime and   intrinsic quantum yield perfectly match those reported for   dinuclear 4f-4f helicates in which the EuIII ion has the same   coordination environment.

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